Just added water today to my 55g tank. This is a dirted tank, that will have plants. The water temperature gets very warm here during the summer, low 80s. So the tetra fish need to tolerate warmer water. I am thinking about a tetra fish oriented tank, with as many of the same species as can safely have living in it. I hope to get these fish from a hardy stock that don't have a history of problems. ie diseases common to that species.